FILE - In this May 2, 2012 file photo an employee shows the Beau Sancy diamond, 34.98 carat, at Sotheby's auction house in Zurich, Switzerland. Marie de Medici wore it at her coronation as Queen ...

The Beau Sancy, a 34.98 carat diamond that will be put on sale by Sotheby's auction house in Geneva next month, is presented in Paris, Monday April 23, 2012. The Beau Sancy diamond, a stone of ...

A huge diamond coveted by European kings, queens and princes for centuries, used to reinforce alliances between nations and pawned to pay off royal debts goes on sale at Sotheby's in Geneva on May 15.

A diamond coveted by kings, queens and princes for centuries, used to reinforce alliances between nations and pawned to pay off royal debts, sold for 9 million Swiss francs ($9.57 million) at ...

The 35-carat Beau Sancy diamond was worn by Marie de Medici, Queen consort of Henry IV, at her coronation in 1610. Five bidders spanning three continents competed for the historic jewel at a Sotheby's ...

It has been coveted by royalty and the fabulously rich for more than 400 years. Now the ‘Beau Sancy’ - one of the world’s oldest, most famous and sought after diamonds in private hands - is about to ...

Historic diamond sold by Royal House of Prussia fetches $9.7 million at Geneva auction FILE - In this May 2, 2012 file photo an employee shows the Beau Sancy diamond, 34.98 carat, at Sotheby's auction ...

(AP) GENEVA - Marie de Medici wore it at her coronation as Queen Consort of Henry IV in France in 1610, and now the Beau Sancy diamond is a lavish accessory owned by an anonymous bidder who paid $9.7 ...